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The type of D.C. motor used for shears and punches is?
asked
Mar 20, 2018
by
anonymous
type
dc
motor
used
shears
punches
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1
Answer
answered
Mar 20, 2018
by
anonymous
The type of D.C. motor used for shears and punches is
cumulative compound D.C. motor.
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Mar 15, 2018
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anonymous
Which type of starter is used to start the DC motor?
Which type of starter is used to start the DC motor?
type
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start
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59
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Mar 11, 2018
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Which type of motor is used in lift?
Which type of motor is used in lift?
Last answer:
Synchronous motor
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59
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1
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Mar 11, 2018
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Why DC motor is used for traction?
Why DC motor is used for traction?
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67
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asked
Mar 20, 2018
by
anonymous
If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor?
Last answer:
If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.
ambient
temperature
motor
dc
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor is generally preferred for cranes and hoists ?
Last answer:
D.C. Series motor is generally preferred for cranes and hoists.
dc
motor
cranes
hoists
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76
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
Last answer:
Cumulatively compounded D.C. motor will be suitable along with flywheel for intermittent light and heavy loads.
dc
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be?
Last answer:
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be cumulatively compounded.
dc
motor
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294
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1
answer
asked
Mar 20, 2018
by
anonymous
The condition for maximum power in case of D.C. motor is?
condition
maximum
power
dc
motor
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83
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0
answers
asked
Mar 20, 2018
by
anonymous
For a D.C. shunt motor if the excitation is changed?
Last answer:
For a D.C. shunt motor if the excitation is changed torque will change but power will remain constant.
dc
shunt
motor
excitation
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125
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1
answer
asked
Mar 20, 2018
by
anonymous
For starting a D.C. motor a starter is required because?
Last answer:
For starting a D.C. motor a starter is required because it limits the starting current to a safe value.
starting
dc
motor
starter
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62
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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor is preferred for elevators ?
Last answer:
Cumulative compound D.C. motor is preferred for elevators.
dc
motor
preferred
elevators
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be?
Last answer:
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be less than 50%.
dc
motor
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96
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1
answer
asked
Mar 20, 2018
by
anonymous
In D.C. machines fractional pitch winding is used?
Last answer:
In D.C. machines fractional pitch winding is used to reduce the sparking.
dc
machines
fractional
pitch
winding
used
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302
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1
answer
asked
Sep 18, 2018
by
anonymous
State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor
State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor
Last answer:
Name the starters used for following motors : i) 3 H.P. 3-Ph squirrel cage I.M: i) DOL starter OR ii) Star-Delta Starter OR ii) Auto transformer starter OR iii) Soft start starter. ii) D.C Shunt Motor : 1) Armature resistance starter (Three Point Starter) OR 2) Four Point Starter
starters
used
3-ph
squirrel
cage
induction
motor
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118
views
1
answer
asked
Mar 20, 2018
by
anonymous
The speed control of universal motor used for sewing machines is by?
Last answer:
The speed control of universal motor used for sewing machines is by varying the resistance.
speed
control
universal
motor
used
sewing
machines
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70
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens?
Last answer:
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses.
dc
motor
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95
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1
answer
asked
Mar 20, 2018
by
anonymous
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will?
Last answer:
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will remain unchanged.
dc
motor
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148
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1
answer
asked
Mar 20, 2018
by
anonymous
Starters are used with D.C. motors because?
Last answer:
Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.
starters
used
dc
motors
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60
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1
answer
asked
Mar 20, 2018
by
anonymous
The motor used for the compressors is?
Last answer:
The motor used for the compressors is capacitor-start capacitor-run motor.
motor
used
compressors
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44
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1
answer
asked
Mar 20, 2018
by
anonymous
The shaded pole motor is used for?
Last answer:
The shaded pole motor is used for low starting torque.
shaded
pole
motor
used
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40
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1
answer
asked
Mar 20, 2018
by
anonymous
For which types of D.C. motor, dynamic braking is generally used ?
Last answer:
Shunt motors, Series motors, Compound motors
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dc
motor
dynamic
braking
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66
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1
answer
asked
Mar 20, 2018
by
anonymous
At the instant of starting when a D.C. motor is put on supply, it behaves like?
Last answer:
At the instant of starting when a D.C. motor is put on supply, it behaves like a low resistance circuit.
dc
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent...
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit?
Last answer:
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit a resistance is connected in series with armature.
dc
motor
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114
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature torque of the D.C. shunt motor is proportional to?
Last answer:
The armature torque of the D.C. shunt motor is proportional to armature current.
armature
torque
dc
shunt
motor
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87
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1
answer
asked
Mar 20, 2018
by
anonymous
As the load is increased the speed of D.C. shunt motor will?
Last answer:
As the load is increased the speed of D.C. shunt motor will reduce slightly.
load
increased
speed
dc
shunt
motor
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106
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1
answer
asked
Mar 20, 2018
by
anonymous
The current drawn by the armature of D.C. motor is directly proportional to?
Last answer:
The current drawn by the armature of D.C. motor is directly proportional to the torque required.
dc
motor
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305
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to?
Last answer:
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 25% of the previous value.
dc
motor
series
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141
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. series motor is?
Last answer:
The speed of a D.C. series motor is inversely proportional to the armature current.
speed
series
motor
dc
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70
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1
answer
asked
Mar 20, 2018
by
anonymous
The starting resistance of a D.C. motor is generally?
Last answer:
The starting resistance of a D.C. motor is generally low.
starting
resistance
dc
motor
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76
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1
answer
asked
Mar 20, 2018
by
anonymous
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
Last answer:
By looking at Commutator part of the motor, it can be easily confirmed that a particular motor is D.C. motor.
motor
dc
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79
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1
answer
asked
Mar 20, 2018
by
anonymous
If the field of a D.C. shunt motor gets opened while motor is running?
Last answer:
If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.
field
dc
shunt
motor
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94
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. motor is connected across the A.C. supply it will?
Last answer:
If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.
dc
motor
connected
ac
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
Sparking, is discouraged in a D.C. motor because?
Last answer:
Sparking, is discouraged in a D.C. motor because commutator gets damaged.
sparking
discouraged
dc
motor
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95
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, speed is?
Last answer:
In a D.C. shunt motor, speed is independent of armature current.
dc
shunt
motor
speed
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62
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1
answer
asked
Mar 20, 2018
by
anonymous
A D.C. series motor is that which?
Last answer:
A D.C. series motor is that which has its field winding consisting of thick wire and less turns.
dc
series
motor
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51
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. series motor is operated on A.C. supply, it will?
Last answer:
If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.
dc
series
motor
operated
ac
supply
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63
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. motor can be controlled by varying
The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
Last answer:
The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
speed
dc
motor
varying
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114
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor can be increased by?
Last answer:
The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.
speed
dc
shunt
motor
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88
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature voltage control of D.C. motor provides?
Last answer:
The armature voltage control of D.C. motor provides constant torque drive.
armature
voltage
control
motor
dc
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50
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1
answer
asked
Mar 20, 2018
by
anonymous
Sparking at the commutator of a D.C. motor may result in?
Last answer:
Sparking at the commutator of a D.C. motor may result in damage to commutator segments, damage to commutator insulation, increased power consumption.
sparking
commutator
dc
motor
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110
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?
Last answer:
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.
dc
shunt
motor
conditions
maximum
power
current
armature
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172
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1
answer
asked
Mar 20, 2018
by
anonymous
What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
Last answer:
The armature may burn if the back e.m.f. of a D.C. motor vanishes suddenly.
back
emf
dc
motor
vanishes
suddenly
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377
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor more than its full-load speed can be obtained by?
Last answer:
The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.
dc
shunt
motor
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91
views
1
answer
asked
Mar 20, 2018
by
anonymous
The direction of rotation of a D.C. series motor can be changed by?
Last answer:
The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.
direction
rotation
dc
series
motor
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75
views
1
answer
asked
Mar 22, 2018
by
anonymous
What type of biasing is used in CE amplifier?
What type of biasing is used in CE amplifier?
type
biasing
used
ce
amplifier
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62
views
0
answers
asked
Mar 19, 2018
by
anonymous
Which type of winding is used in 3 phase shell-type transformer ?
Last answer:
Sandwich type winding is used in 3 phase shell-type transformer.
type
winding
used
phase
shell-type
transformer
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108
views
1
answer
asked
Mar 10, 2018
by
anonymous
What type of meter is used to measure current?
What type of meter is used to measure current?
Last answer:
Ammeter
type
meter
used
measure
current
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2.6k
views
3
answers
asked
Mar 22, 2018
by
anonymous
The voltage used for suburban trains in D.C. system is usually?
Last answer:
The voltage used for suburban trains in D.C. system is usually 600 to 750 V.
voltage
used
suburban
trains
dc
system
usually
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64
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1
answer
asked
Mar 20, 2018
by
anonymous
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value...
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the?
Last answer:
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the series motor.
dc
motor
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206
views
1
answer
asked
Mar 20, 2018
by
anonymous
In a differentially compounded D.C. motor, if shunt field suddenly opens?
Last answer:
In a differentially compounded D.C. motor, if shunt field suddenly opens the motor will first stop and then run in opposite direction as series motor.
dc
motor
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70
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1
answer
...